Method of making a file.



J. RIDGE.

METHOD OF MAKING A FILE. APPLICATION FILED JULY 21, 1913.

1,120,973. V Patented Dec.15,1914.

Fig.1.

Wiinesses. Inventor.

John Rid e, b msiiwm ITED STATES PATENT OFFICE.

JQHN RIDGE, OF NASHUA, NEW HAMPSHIRE.

METHOD 9F MAKING A FILE.

Application filed July 21, 1913.

To all whom it may concern Be it known that I, JOHN RIDGE, a citizen of the United States, residing at Nashua, county of I-Iillsboro, State of New Hampshire, have invented an Improvement in Methods of Making Files, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to files and has for its object to provide a novel method of making a file which is formed on its face with a central groove to divide the surface thereof into two parts on which the teeth are cut in opposite directions.

The features wherein my invention re sides will be more fully hereinafter set forth and will then be pointed out in detail in the appended claim.

Referring now to the drawings wherein I have illustrated some of the steps involved in the practice of my invention, Figure 1 is a perspective view of'a section of the strip of metal from which the file is made; Fig. 2 is a perspective view of one of the sections into which this strip is cut and from which the file is made. Fig. 3 is a perspective View of the completed file.

Before describing the process which constitutes my invention, I will refer briefly to the file which is produced as the result of carrying out the process. Such a file is shown in Fig. 3 and the body 1 thereof has formed in one face a groove 2 which extends longitudinally of the file and preferably centrally of the body thereby to divide the face of the file into two portions 3 and 4. The teeth are cut on these two portions 3 and 4 in opposite directions, the teeth on each part inclining outwardly from the groove 2 toward the end of the file. The file is also provided atone end with theiusual tang 5 by which a handle may be secured thereto and in the file herein shown the grooves 2 and teeth formed in the portions 3 ande terminate a slight distance from the root of the tang. In order to make a file of this nature I first provide a strip 6 of metal which has a width and thickness corre- Specification of Letters Iatcnt.

Patented Dec. 15, 1914.

Serial No. 785,153.

file l which is to be made and I then form in one face of said strip 6 a plurality of grooves 2 which are situatedv in line with each other, but are separated from each other. These grooves will preferably be formed in the strip 6 by a rolling process and I propose to form said grooves duringthe process of rolling said strip .6 from an ingot. This can readily be done by providing the final rollers of the rolling mill with ribs which will operate to form grooves 2 on the strip during the last pass of the strip through the rolls.

I will preferably make the rolls of such shape that each groove 2 will be approximately twice the length of the completed file. After the strip 6 has thus been produced with the grooves 2 in one face thereof said strip is cut into sections 7, each of ,70 which has a groove 2 therein extending from one end nearly to the other end, as shown in Fig. 2. This can be readily accomplished by cutting the strip transversely in the places indicated by the dotted lines 8, the alternate cuts extending transversely across each groove 2, midway of its length and the other cuts extending midway between'the adjacent ends of the two grooves. After the grooved section 7 is thus formed the ungrooved end 9 thereof is subjected to a swaging process by which the tang 5 is formed and the teeth of the file are cut in the two portions 3 and i on opposite sides of the groove 2. This cutting of the teeth will be accomplished in the usual method and after the teeth are out, the file will. be properly tempered and is then ready for use.

By means of my process a file having a central groove and the teeth on the two portions 3 and cut in opposite directions can be produced as easily and economically as an ordinary file.

1 one face of a stripof metal having the width. and tiickness of the file to be completed,

which grooves are situated in line with but separated from each other, severing the strip name to this specification, in the presence of into sections, each of which hafs a groove two subscribing Witnesses. extending from one end thei'eo' nearly to the other end and then forming the teeth JOHN RIDGE in the grooved face'of the file on both sides of said groove.

In testimony whereof, I have signed my Vitnesses KATHLEEN M. SCOTT, THOMAS J DR-UMMOND.

Copies of this fiatent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

